Data Probe Information Page: pH probe Kathryn C., Katie M., Jillian S., Melissa R.
Purpose of Probe
To test the ph level of a certain liquid sample.
How do Scientists Use this Measurement?
To measure the concentration of hydrogen ions in a solution in order to determine how acidic or basic a solution is.
Resources
Add links to relevant online resources, e.g calibration curves, vendor pages, etc.
Diagram or Photo of Probe Setup
Setup / Calibration Instructions
Record the steps that a student would use to calibrate or use this probe.
- plug the vernier calibrator into the wall, turn it on, and plug the prob cord into channel 1.
- submerge the probe about 1-2 inches into a known ph solution, making sure not to touch the sides or the bottom.
- if the reading is < .02 > of the known ph of the solution, you need to calibrate.
To calibrate: *note the probe only needs to be calibrated if it is off by more than .02 of the known ph. The probe should automatically calibrate, so manual calibration is not always necessary***
-touch the red box on the screen where the reading is.
- another box will pop up prompting you to select an option--> click "calibrate"
- check the box that says one point calibration if you only have one known solution to calibrate it to.
- click " calibrate now"
- enter the known ph value in the "reading 1 known value" (ex: if you have a solution that you know has a ph of 4 then you will calibrate your probe to read a ph of 4, so enter this number as your known value)
- click "okay"
- you will see "live calibration in process, do you want to continue?" click "keep", and then click "okay"
- you will now be brought to the main page again showing the ph value of the probe.
- it should now read within .02 value of the known solution.
- when inserting the prob into the solution, wait until the reading barely fluctuates and record the average value.
- in between each reading, the prob must be rinsed in distilled water.
- when finished taking all of your ph values, screw the probe back into the storage solution and turn the vernier system off by holding the power button.
How do I know that the probe is working properly?
Test the probe on a buffer and make sure the value is within .02 of the known value.
Possible Applications/Projects
- to determine which household products are acids and bases
- acid/base titrations
- monitor ph changes during chemical reactions
Purpose of Probe
To test the ph level of a certain liquid sample.How do Scientists Use this Measurement?
To measure the concentration of hydrogen ions in a solution in order to determine how acidic or basic a solution is.Resources
Add links to relevant online resources, e.g calibration curves, vendor pages, etc.Diagram or Photo of Probe Setup
Setup / Calibration Instructions
Record the steps that a student would use to calibrate or use this probe.- plug the vernier calibrator into the wall, turn it on, and plug the prob cord into channel 1.
- submerge the probe about 1-2 inches into a known ph solution, making sure not to touch the sides or the bottom.
- if the reading is < .02 > of the known ph of the solution, you need to calibrate.
-touch the red box on the screen where the reading is.
- another box will pop up prompting you to select an option--> click "calibrate"
- check the box that says one point calibration if you only have one known solution to calibrate it to.
- click " calibrate now"
- enter the known ph value in the "reading 1 known value" (ex: if you have a solution that you know has a ph of 4 then you will calibrate your probe to read a ph of 4, so enter this number as your known value)
- click "okay"
- you will see "live calibration in process, do you want to continue?" click "keep", and then click "okay"
- you will now be brought to the main page again showing the ph value of the probe.
- it should now read within .02 value of the known solution.
- when inserting the prob into the solution, wait until the reading barely fluctuates and record the average value.
- in between each reading, the prob must be rinsed in distilled water.
- when finished taking all of your ph values, screw the probe back into the storage solution and turn the vernier system off by holding the power button.
How do I know that the probe is working properly?
Test the probe on a buffer and make sure the value is within .02 of the known value.
Possible Applications/Projects
- to determine which household products are acids and bases
- acid/base titrations
- monitor ph changes during chemical reactions